how to determine whether an IP address in private?

Question

So far I have this code:

NetworkInterface[] adapters = NetworkInterface.GetAllNetworkInterfaces();

foreach (NetworkInterface adapter in adapters)
{
  IPInte         


        

Answer 1

10.0.0.0        -   10.255.255.255  (10/8 prefix)
172.16.0.0      -   172.31.255.255  (172.16/12 prefix)
192.168.0.0     -   192.168.255.255 (192.168/16 prefix)

Use the ranges defined in the RFC (as suggested by Anders); than use regular expression to detect/remove the private IP address from the list.

Here is a sample RegEx to detect private IP addresses. (Not tested by me)

(^127\.0\.0\.1)|
(^10\.)|
(^172\.1[6-9]\.)|(^172\.2[0-9]\.)|(^172\.3[0-1]\.)|
(^192\.168\.)